- Boost-users - lists.boost.org

Boost with mingw creates .lib not .a
by John Arbash Meinel 17 Jan '05

17 Jan '05

I was wondering if there is a specific reason still that when using mingw to build the boost libraries it defaults to using the .lib extension? I was only able to find the following post: http://article.gmane.org/gmane.comp.lib.boost.devel/79594 Which is where David Abrahams states that file extensions are based on platform and not based on toolset. I've been using mingw lately, and at least current versions are able to find a library with a .lib extension without any problem. However, visual studio can not use that file as a library, and mingw will look for a .a first. What I'm thinking is that at least for the undecorated versions of the libraries (boost_python.lib) it should use the common convention for the compiler, that way you could have both in the same directory, and have the compiler pick the right one. I realize I can force this with a '-sSUFLIB=.a', I was just wondering if there was a reason the extension is based on platform, and not on TOOLS. John =:->

2 1

boost::filesystem::path question
by matthew.j.polder＠itt.com 16 Jan '05

16 Jan '05

Hi, I typically work on Windows and Unix. Our network has a bunch of shared drives that I can access from both Windows and Unix by using the form: //filesystem/some/path/ It looks like boost::filesystem is getting rid of the double slash at the beginning and replacing it with a single slash. This will work on Unix but WIndows needs the double slashes. Any way around this? thanks, matthew ************************************ This e-mail and any files transmitted with it are proprietary and intended solely for the use of the individual or entity to whom they are addressed. If you have received this e-mail in error please notify the sender. Please note that any views or opinions presented in this e-mail are solely those of the author and do not necessarily represent those of ITT Industries, Inc. The recipient should check this e-mail and any attachments for the presence of viruses. ITT Industries accepts no liability for any damage caused by any virus transmitted by this e-mail. ************************************

5 8

boost 1.32 with gcc 3.3 for darwin
by Becky Bendick 15 Jan '05

15 Jan '05

To anyone who is interested: With the assistance of a huge number of very useful people, I've sorted out how to successfully install the boost 1.32 package on Mac Darwin with gcc 3.3. There are two problems to solve: 1. some libraries are made but not usable because of errors like: /sw/include/boost/numeric/ublas/vector_expression.hpp:1837: error: due > to a defect in the G++ 3.2 ABI, G++ has assigned the same mangled > name to > twodifferent types In file included from > /sw/include/boost/numeric/ublas/matrix.hpp:23, > from conftest.cc:100: > /sw/include/boost/numeric/ublas/matrix_expression.hpp:5156: error: > due to a > defect in the G++ 3.2 ABI, G++ has assigned the same mangled name > to two > different types > configure:23533: $? = 1 > configure: failed program was: > | /* confdefs.h. */ The solution is to put -fabi-version=0 into your CFLAGS and CXXFLAGS, rebuild bjam, and install boost with the rebuilt bjam. 2. Install hangs on xml_grammar. The solution is outlined in http://lists.boost.org/MailArchives/boost/msg76758.php Or include the following: <darwin><release><inline>off Thanks to everyone who helped out. ------------------------------------------------------------------------ ---------------------- Rebecca Bendick, Ph.D. Bullard Laboratories University of Cambridge Madingley Road CAMBRIDGE CB3 0EZ United Kingdom bendick(a)esc.cam.ac.uk

1 0

boost1.32
by Becky Bendick 14 Jan '05

14 Jan '05

I need the boost libraries in order to compile a new application. I installed the boost1.31 package from the fink release, using fink install boost 1.31 without any trouble, but when I then tried to configure the dependent application, it found that the boost/numeric/ublas/matrix.hpp library was unusable. On the advice of the boost-users list, I then installed boost 1.32, using the prebuilt executable for Darwin available on the boost web site. The install hung several times creating the serialization libraries, so I installed using the tag --without-serialization, and completed the install successfully that way. However, I still get an error when I configure the dependent package, saying that the matrix.hpp library is unusable. The config.log says: checking for boost/numeric/ublas/matrix.hpp usability... configure:22782: g++ -c -I/sw/include -O2 -ansi -Wall -Wno-unused -I/sw/include -I/usr/local/include /boost-1_32 conftest.cc >&5 In file included from /usr/local/include/boost-1_32/boost/numeric/ublas/traits.hpp:27, from /usr/local/include/boost-1_32/boost/numeric/ublas/storage.hpp:29, from /usr/local/include/boost-1_32/boost/numeric/ublas/matrix.hpp:21, from configure:22826: /usr/local/include/boost-1_32/boost/numeric/ublas/ returntype_deduction.hpp:53: warning: use of `long double' type; its size may change in a future release /usr/local/include/boost-1_32/boost/numeric/ublas/ returntype_deduction.hpp:53: warning: (Long double usage is reported only once for each file. /usr/local/include/boost-1_32/boost/numeric/ublas/ returntype_deduction.hpp:53: warning: To disable this warning, use -Wno-long-double.) In file included from /usr/local/include/boost-1_32/boost/numeric/ublas/vector.hpp:24, from /usr/local/include/boost-1_32/boost/numeric/ublas/matrix.hpp:22, from configure:22826: /usr/local/include/boost-1_32/boost/numeric/ublas/ vector_expression.hpp:1924: error: due to a defect in the G++ 3.2 ABI, G++ has assigned the same mangled name to two different types In file included from /usr/local/include/boost-1_32/boost/numeric/ublas/matrix.hpp:23, from configure:22826: /usr/local/include/boost-1_32/boost/numeric/ublas/ matrix_expression.hpp:5201: error: due to a defect in the G++ 3.2 ABI, G++ has assigned the same mangled name to two different types configure:22785: $? = 1 configure: failed program was: | #line 22760 "configure" | /* confdefs.h. */ Higher in the config.log is another error (unrelated?) that doesn't seem to cause any trouble: gcc -E -I/sw/include conftest.c configure:15096:28: ac_nonexistent.h: No such file or directory configure:15085: $? = 1 configure: failed program was: | #line 15070 "configure" | /* confdefs.h. */ Here's the info on my gcc. What is wrong with it ? And how can I fix it? gcc -v </dev/null >&5 Reading specs from /usr/libexec/gcc/darwin/ppc/3.3/specs Thread model: posix gcc version 3.3 20030304 (Apple Computer, Inc. build 1671) Thanks! Becky ------------------------------------------------------------------------ ---------------------- Rebecca Bendick, Ph.D. Bullard Laboratories University of Cambridge Madingley Road CAMBRIDGE CB3 0EZ United Kingdom bendick(a)esc.cam.ac.uk

2 2

xml_grammar
by Becky Bendick 14 Jan '05

14 Jan '05

I'm trying to install boost1.32 using the prebuilt bjam for mac darwin, but it seems to hang on darwin-C++-action bin/boost/libs/serialization/build/libboost_serialization.a/darwin/ release/xml_grammar.o or perhaps this just takes hours, which seems unlikely. What am I doing wrong, and how do I fix it? Thanks, Becky ------------------------------------------------------------------------ ---------------------- Rebecca Bendick, Ph.D. Bullard Laboratories University of Cambridge Madingley Road CAMBRIDGE CB3 0EZ United Kingdom bendick(a)esc.cam.ac.uk

3 2

Multithreaded Signal Library
by Stephen torri 14 Jan '05

14 Jan '05

Since it has been advise by many people in the past that retrofitting software is troublesome and expense. I am looking at the issues of redesigning the signals library from scratch to keep the same interface. Before providing a new solution to consider I have a few questions. Is the relationship of signals to slots 1 to N where N = 0 to some value? From what I have read I believe this is true. Since signals are not copyable? N processes desiring to signal the M slots (N = 0 to some value N, M = 0 to some value M) will have to do it through the same signal object if the processes are of the same type (class has an signal object as a variable). Right? The second question comes from my initial understanding of the signals library. I was thinking about this scenario: There is a class call Cart which has a signal boost::signal<void()> in_Parking_Lot in it. Since a store will have multiple Carts for customers to use the owner has programmed his carts to signal the front desk computer when they are moved out of the store. class Cart { private: boost::signal<void()> in_Parking_Lot; public: void init (FrontDesk& fd) { in_Store = true; in_Parking_Lot.connect(fd); void process () { for (;;) { Check location (If in store set in_Store = true vice versa if not). if ( ! in_Store ) { in_Parking_Lot(); } } }; So if I have a very small shop with 50 Carts, all 50 Carts be using the same signal object to alert the front desk. If I had a big computer with 51 cpus (50 Carts and 1 FrontDesk) to run each process I have a race condition. Which process gets to alert the front desk when? >From what I understand the relationship of signals to slots is (1:N) where N is 0 to some number. So I have to have some structure in place so that I keep things safe (e.g. no race conditions or starvation) while maintaining throughput when the 50 processes try to send a signal at the same tiem. So given my example I was wondering what are the properties that I need to maintain? For example should each call to the signal's operator() function be blocking (each signaling process must update all the slots listening for the signal before returning) or non-blocking (some other process handles updating the slots while the signaling process returns back to work right away). The final question is that if indeed the relationship of signals to slots is 1:N then the multi-threading problems begins to surface more predominately. That is T threads, where T is a Cart object, use 1 signal to notify N slots. We have a restricted resource, the 1 signal, to update N slots at various times during the lifetime of the T threads. Is this the problem of using the signal library with multiple threads? I will leave things there for now and await your response. Stephen

1 0

newbie question: large multiarray in a mult-file project
by M L 13 Jan '05

13 Jan '05

Hi, I need to declare a large multiarray in a multi-class project, something in the order of 10,000 x 300 x sizeof(a struct of 48 byte), I need to put the matrix in a header file so that other classes can see it. would it be a good idea to put all of the following lines in a header file? or the memory allocation should really be done in a .cpp file while leaving a pointer of some sort in the header? in other words, what would be a better way of declaring a large multiarray in a multi-file project? typedef boost::multi_array<xystruct, 2> xyType; //xystruct is a struct of 6 doubles xyType xy(boost::extents[10000][300]); many thanks mike

1 0

RE: [Boost-users] error in boost/graph/fruchterman_reingold.hpp
by John Wilkinson 13 Jan '05

13 Jan '05

This one works, correcting the "grpah" typo: http://boost-consulting.com/boost/libs/graph/doc/fruchterman_reingold.ht ml -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Welson Sun Sent: Wednesday, January 12, 2005 10:04 PM To: boost-users(a)lists.boost.org Subject: RE: [Boost-users] error in boost/graph/fruchterman_reingold.hpp The link you provided is 404 error. -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Jamie Wilkinson Sent: Wednesday, January 12, 2005 2:16 AM To: Boost-users(a)lists.boost.org Subject: [Boost-users] error in boost/graph/fruchterman_reingold.hpp The doc at http://boost-consulting.com/boost/libs/grpah/doc/fruchterman_reingold.ht ml suggests that there is a 4 argument version of the function, taking only the graph, a position map, width and height; but attempts to compile such a function against the headers from the latest CVS results in a compile error: error: no matching function for call to ` fruchterman_reingold_force_directed_layout(Umbrella::Document&, Umbrella::View::load_from_document()::PositionMap&, double&, double&)' Removing the typenames Param, Tag, and Rest from lines 371-372 of the header allows the compile to continue. Index: boost/graph/fruchterman_reingold.hpp =================================================================== RCS file: /cvsroot/boost/boost/boost/graph/fruchterman_reingold.hpp,v retrieving revision 1.5 diff -u -c -r1.5 fruchterman_reingold.hpp cvs diff: conflicting specifications of output style *** boost/graph/fruchterman_reingold.hpp 29 Dec 2004 16:53:05 -0000 1.5 --- boost/graph/fruchterman_reingold.hpp 12 Jan 2005 09:18:16 -0000 *************** *** 368,375 **** params); } ! template<typename Graph, typename PositionMap, typename Dim, typename Param, ! typename Tag, typename Rest> void fruchterman_reingold_force_directed_layout(const Graph& g, PositionMap position, --- 368,374 ---- params); } ! template<typename Graph, typename PositionMap, typename Dim> void fruchterman_reingold_force_directed_layout(const Graph& g, PositionMap position, _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

1 0

Date-Time question on seconds since epoch
by Bill Lear 13 Jan '05

13 Jan '05

I'd like to determine the total number of seconds between a date and the epoch ('00:00:00 1970-01-01 UTC'), The date can be in a timezone that has daylight savings. The date should be converted to UTC, with appropriate daylight savings adjustments made, and then the epoch subtracted from it. This should mirror the unix GNU 'date' utility, which can be run as: % TZ="America/New_York" date --date='2004-10-04 12:14:32' +%s 1096906472 I've looked at the doc, but it's not clear how to do this. Could someone give me a few pointers, please? Thanks. Bill

3 7

VC7.1 compile errors using boost::multi_array with template functions
by Thomas A. Seidel 13 Jan '05

13 Jan '05

Hello everybody, I wrote 2 simple template functions for printing the content of arrays which model boost::multi_array. Template functions are necessary to be independent of the exact array type (multi_array_ref, subarrays, array_views and so on), dimension and element type. Here is the corresponding code snippet: ------------------------------------------------------- #include <cstddef> #include <iostream> #include <string> #include <boost/multi_array.hpp> template <typename T, std::size_t Dim, template <typename, std::size_t> class ArrayType> std::ostream& print(const ArrayType<T, Dim>& ma, std::ostream& os); template <typename T, template <typename, std::size_t> class ArrayType> std::ostream& print(const ArrayType<T, 1>& ma, std::ostream& os); template <typename T, template <typename, std::size_t> class ArrayType> inline std::ostream& print(const ArrayType<T, 1>& ma, std::ostream& os) { os << "| "; typename boost::multi_array<T, 1>::size_type ma_size = ma.size(); for (typename boost::multi_array<T, 1>::size_type i = 0 ; i < ma_size; i++) os << ma[i] << ' '; return os; } template <typename T, std::size_t Dim, template <typename, std::size_t> class ArrayType> inline std::ostream& print(const ArrayType<T, Dim>& ma, std::ostream& os) { os << std::string(Dim, '|') << ' '; typename boost::multi_array<T, Dim>::size_type ma_size = ma.size(); for (typename boost::multi_array<T, Dim>::size_type i = 0 ; i < ma_size; i++) { typename ArrayType<T, Dim>::const_reference row = ma[i]; print(row, os); } return os; } int main(int argc, char** argv) { boost::multi_array<unsigned int, 3> test(boost::extents[4][4][4]); for (unsigned int i = 0; i < 4; i++) for (unsigned int j = 0; j < 4; j++) for (unsigned int k = 0; k < 4; k++) test[i][j][k] = k; print(test, std::cout); std::cout << std::endl; print(test[0], std::cout); std::cout << std::endl; return 0; }; ------------------------------------------------------- The code compiles fine under Linux (Suse 9.1, gcc3.3.3) and upon execution produces the following (expected) output: ||| || | 0 1 2 3 | 0 1 2 3 | 0 1 2 3 | 0 1 2 3 || | 0 1 2 3 | 0 1 2 3 | 0 1 2 3 | 0 1 2 3 || | 0 1 2 3 | 0 1 2 3 | 0 1 2 3 | 0 1 2 3 || | 0 1 2 3 | 0 1 2 3 | 0 1 2 3 | 0 1 2 3 || | 0 1 2 3 | 0 1 2 3 | 0 1 2 3 | 0 1 2 3 However, compiling the above code with VC7.1 produces 5 errors caused by the wrong deduction of the template parameters (the corresponding build-log is attached - unfortunately only in german language because I do not have an english VC version available, but its highly technical stuff anyway). VC7 always deduces the 'ArrayType'-type for the template function wrong. The type VC7 uses for an instantiation is the direct base class (e.g. multi_array_ref instead of multi_array) instead of the actual argument type and in the end tries to call nonexistent member-functions and constructors. A search in the microsoft compiler-documentation didn't reveal a solution for my problem. So, is this a known bug/error/problem of VC7 and does anybody know an elegant workaround???? Thanks in advance!! Regards, Thomas

1 0